Saica, Kiku 16, Gem 16 and Halmat
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Bibliography
- Pritchard, Michael and St. Denny, Douglas. Spy Cameras — A century of detective and subminiature cameras. London: Classic Collection Publications, 1993. ISBN 1-874485-00-3. Pp.75, 77 and 79 (the Halmat is spelled "Kalmet" or "Kalmat" by mistake).